247 lines
6.6 KiB
C
247 lines
6.6 KiB
C
#ifndef _FS_CEPH_LIBCEPH_H
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#define _FS_CEPH_LIBCEPH_H
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#include "ceph_debug.h"
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#include <asm/unaligned.h>
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#include <linux/backing-dev.h>
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#include <linux/completion.h>
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#include <linux/exportfs.h>
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#include <linux/bug.h>
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#include <linux/fs.h>
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#include <linux/mempool.h>
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#include <linux/pagemap.h>
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#include <linux/wait.h>
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#include <linux/writeback.h>
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#include <linux/slab.h>
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#include "types.h"
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#include "messenger.h"
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#include "msgpool.h"
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#include "mon_client.h"
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#include "osd_client.h"
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#include "ceph_fs.h"
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/*
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* mount options
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*/
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#define CEPH_OPT_FSID (1<<0)
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#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
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#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
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#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
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#define CEPH_OPT_DEFAULT (0)
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#define ceph_set_opt(client, opt) \
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(client)->options->flags |= CEPH_OPT_##opt;
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#define ceph_test_opt(client, opt) \
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(!!((client)->options->flags & CEPH_OPT_##opt))
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struct ceph_options {
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int flags;
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struct ceph_fsid fsid;
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struct ceph_entity_addr my_addr;
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int mount_timeout;
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int osd_idle_ttl;
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int osd_timeout;
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int osd_keepalive_timeout;
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/*
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* any type that can't be simply compared or doesn't need need
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* to be compared should go beyond this point,
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* ceph_compare_options() should be updated accordingly
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*/
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struct ceph_entity_addr *mon_addr; /* should be the first
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pointer type of args */
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int num_mon;
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char *name;
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struct ceph_crypto_key *key;
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};
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/*
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* defaults
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*/
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#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
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#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
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#define CEPH_OSD_KEEPALIVE_DEFAULT 5
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#define CEPH_OSD_IDLE_TTL_DEFAULT 60
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#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
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#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
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#define CEPH_AUTH_NAME_DEFAULT "guest"
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/*
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* Delay telling the MDS we no longer want caps, in case we reopen
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* the file. Delay a minimum amount of time, even if we send a cap
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* message for some other reason. Otherwise, take the oppotunity to
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* update the mds to avoid sending another message later.
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*/
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#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
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#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
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#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
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/* mount state */
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enum {
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CEPH_MOUNT_MOUNTING,
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CEPH_MOUNT_MOUNTED,
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CEPH_MOUNT_UNMOUNTING,
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CEPH_MOUNT_UNMOUNTED,
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CEPH_MOUNT_SHUTDOWN,
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};
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/*
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* subtract jiffies
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*/
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static inline unsigned long time_sub(unsigned long a, unsigned long b)
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{
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BUG_ON(time_after(b, a));
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return (long)a - (long)b;
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}
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struct ceph_mds_client;
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/*
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* per client state
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*
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* possibly shared by multiple mount points, if they are
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* mounting the same ceph filesystem/cluster.
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*/
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struct ceph_client {
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struct ceph_fsid fsid;
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bool have_fsid;
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void *private;
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struct ceph_options *options;
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struct mutex mount_mutex; /* serialize mount attempts */
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wait_queue_head_t auth_wq;
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int auth_err;
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int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
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u32 supported_features;
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u32 required_features;
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struct ceph_messenger msgr; /* messenger instance */
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struct ceph_mon_client monc;
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struct ceph_osd_client osdc;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *debugfs_dir;
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struct dentry *debugfs_monmap;
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struct dentry *debugfs_osdmap;
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#endif
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};
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/*
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* snapshots
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*/
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/*
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* A "snap context" is the set of existing snapshots when we
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* write data. It is used by the OSD to guide its COW behavior.
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*
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* The ceph_snap_context is refcounted, and attached to each dirty
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* page, indicating which context the dirty data belonged when it was
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* dirtied.
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*/
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struct ceph_snap_context {
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atomic_t nref;
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u64 seq;
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u32 num_snaps;
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u64 snaps[];
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};
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static inline struct ceph_snap_context *
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ceph_get_snap_context(struct ceph_snap_context *sc)
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{
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/*
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printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
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atomic_read(&sc->nref)+1);
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*/
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if (sc)
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atomic_inc(&sc->nref);
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return sc;
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}
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static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
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{
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if (!sc)
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return;
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/*
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printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
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atomic_read(&sc->nref)-1);
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*/
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if (atomic_dec_and_test(&sc->nref)) {
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/*printk(" deleting snap_context %p\n", sc);*/
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kfree(sc);
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}
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}
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/*
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* calculate the number of pages a given length and offset map onto,
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* if we align the data.
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*/
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static inline int calc_pages_for(u64 off, u64 len)
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{
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return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
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(off >> PAGE_CACHE_SHIFT);
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}
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/* ceph_common.c */
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extern const char *ceph_msg_type_name(int type);
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extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
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extern struct kmem_cache *ceph_inode_cachep;
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extern struct kmem_cache *ceph_cap_cachep;
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extern struct kmem_cache *ceph_dentry_cachep;
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extern struct kmem_cache *ceph_file_cachep;
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extern struct ceph_options *ceph_parse_options(char *options,
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const char *dev_name, const char *dev_name_end,
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int (*parse_extra_token)(char *c, void *private),
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void *private);
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extern void ceph_destroy_options(struct ceph_options *opt);
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extern int ceph_compare_options(struct ceph_options *new_opt,
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struct ceph_client *client);
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extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
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void *private,
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unsigned supported_features,
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unsigned required_features);
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extern u64 ceph_client_id(struct ceph_client *client);
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extern void ceph_destroy_client(struct ceph_client *client);
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extern int __ceph_open_session(struct ceph_client *client,
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unsigned long started);
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extern int ceph_open_session(struct ceph_client *client);
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/* pagevec.c */
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extern void ceph_release_page_vector(struct page **pages, int num_pages);
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extern struct page **ceph_get_direct_page_vector(const char __user *data,
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int num_pages,
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bool write_page);
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extern void ceph_put_page_vector(struct page **pages, int num_pages,
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bool dirty);
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extern void ceph_release_page_vector(struct page **pages, int num_pages);
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extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
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extern int ceph_copy_user_to_page_vector(struct page **pages,
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const char __user *data,
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loff_t off, size_t len);
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extern int ceph_copy_to_page_vector(struct page **pages,
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const char *data,
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loff_t off, size_t len);
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extern int ceph_copy_from_page_vector(struct page **pages,
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char *data,
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loff_t off, size_t len);
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extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data,
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loff_t off, size_t len);
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extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
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#endif /* _FS_CEPH_SUPER_H */
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